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According to Stewart, an increase in bone mineral density among older exercisers has been observed in previous studies, but this increase was lacking in the current study because the fitness program was probably of too low intensity or too short in duration. 30 minute workout "Older people will likely have to exercise either harder or for longer 30 minute workout than six months for there for there to be a 30 minute workout substantial increase in bone density," says study co-author and endocrinologist Suzanne Jan de Beur, an assistant professor at Hopkins who specializes in bone health. "Our results show that moderate-intensity exercise can increase fitness and reduce body fat, which are important for overall health, but gains in bone density were found only among those who achieved the greatest gains in fitness in six months. Fat loss with exercise did not result in a loss of bone mass, a problem commonly seen when patients lose weight with diet alone."
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